Improvement in door-knobs



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JOHN- W. GROGAN, OF BROOKLYN, NEW YORK, ASSIGNOR T0 HIMSELF AAND JAMESDUFFY, OF SAME PLACE.

Letters Patent No. 100,026, dated Fahnen/22, 1870; antedated February12, 1870.

IMPROVEMENT IN DOOR-ENOES.

, The Schedule referred to in 4these Letters Patent and' making part ofthe same.

To all wh cm ct may concern: y

Be it known that I, JOHN W. G'ROGAN, of Brook'- lyn, in the county ofKings, and State of New York,

have invented and made a new and useful Improvement in Door-Knobs; and Ido hereby declare the following to be a full, clear, and exactdescription of the said invention, reference being had to the annexeddrawing making part of this specification, whereinr Figure l is asectonof a knob complete for use on a lock or latch-spindle,

Figure 2 is a section of the shells detached, Figure 3 is a face viewot' one of the shells, and .Egure 4 is a face view ot' the other shell.

Similar letters denote the same parts. This invention relates to a knobthat is formed with -a surface of' white metal in imitation of' silver;and

The improvement consists in two shells of' brass or other metalpossessing the requisite strength, and cast or pressed up to shape andunited by interlocking clutches, in combination with a covering ot'white metallic alloy that is cast around the shells ot the knob andtirmly holds said shells together, at the same time forming a surfacemetal that can' be'tnrned, polished, and burnished to resemble silver.The knob made' in this manner is strong, light, and handsome; itssurface is durable and can be -cleaned without injury.

'l'he'silver-plated knobs for which the presentl are intended assubstitutes are very liable to injury by the plating wearing oti` bycleaning or handling, and are much more expensive than my aforesaidknob.

a is the shank of the knob formed with the shell b composingr half'ofthe knob.

c is the shell forming the other half of the knob.

lhese shells are to be made ot iron, brass, or other metal that issntciently strong and sti", and the shells b and c are locked togetherby projections t' on one of the shells entering corresponding recessesin the other shell.

1f desired, these projections might be in the form of rivets to fastenthe parts together, or a bayonet orv other locking device may be used toconnect the halt` shells together. l

I provide a mould of the size and shape internally that the outside ofthe knob is required to-be, and the shells and mould bearsuch relationto each other that when the knob is placed Within the mould there willbe left the necessary space for receiving the melted metal that forms acomplete coating around the entire knob and spindle and eti'ectuallysecures the shells of the knob together.

The mould should be of metal, and the composition or alloy made use ,ofis a white metal imitating silver in color` and texture.

The coating metal is to be poured into the mould, y

and makes a handsome surface to the knob and unites the shells rmlytogether, and the coating metal is specilied, and the joint covered andstrengthened by the coating metal that surrounds the knob and forms asurface for the same, substantially as set forth.

In witness whereof- I have hereunto set my signature this 20th day ofApril, A. D. 1809.

JOHN W. GROGAN.

Witnesses:

GEO. D. WALKER, Guo. T. Bruckner.

